Pulverizing apparatus



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PULVERI Z ING APPARATUS Filed March 19, 1951 2 Sheets-Sheet 2 w. ,y W R Fatented Oct. 4, 1932 warren STATES PATENT OFFICE WILLTAM ARMSTRONG WOODESON, F GATESHEAD-ON-TYNE, ENGLAND, ASSIGNOR TO SOCIETE ANONYME; FOURS 8a APPAREILS STEIN, 0F PARIS, FRANCE, A CORPORA- VTION or FRANCE PULVERIZING APPARATUS Application filed March 19, 1931, Serial No. 523,840, and in Great Britain November 1, 1930.

In the British Patent No. 281,023 of 27th in powdered form to boiler and other furnaces, there being associated with such pulverizer means for drying the fuel. Although in most cases preheating air and passing it to the fuel before, during or after pulverization is satisfactory, irrespective of the path pursued by the fuel, it has been found that when very wet coal has to be dealt with, which occasionally happens, more or less intricate passages such as have heretofore been employed may become obstructed due to caking of the fuel.

According to the present invention it is arranged that the fuel shall be introduced directly into the pulverizer from a moving conveyor which in contradistinction to a chute or stationary passage exposed to hot air will ensure an uninterrupted supply of fuel to the pulverizer whatever its conditions.

Another feature of the invention consists in the employment of a coal conveyor arranged to discharge into a pulverizer through a hinged inspection door by which it is carried and driven by gear which includes toothed wheels one whereof is coaxial with the hinge axis of the door and consequently always in mesh with its companion so that the train is not interfered with when opening and closing the door.

In the accompanying drawings Figs. 1 and 2 are elevations at right angles to one another and Fig. 3 is a plan of part of a pulverizer plant for use in the firing of marine and land boilers, showing one embodiment of the invention from which modifications will be readily ascertainable.

As here shown, 1 represents a pulverizing chamber the outlet 2 of which is connected to a cyclone separator 3, in turn connected by a pipe 4: to the casing 5 of a suction fan, the fan and pulverizer being driven by a shaft 6, all substantially as in the case of the apparatus in the British patent referred to.

As in the former instance, further, the.

pulverizer chamber 1' is fitted with an inspection door 7 working on hinges 8.

According to the present invention coal is introduced into the pulverizing chamber 1 through an opening in the door 7 by means of an endless belt 9 which travels around drums 10, 11 carried by brackets 12 secured to the door, the bearing 13 for drum 11 being adjustable to vary the belt tension. The upper run of the belt is supported by a bed 14 carried from the brackets 12 by a strap 15, and co-operates with the foot 16 of a hopper 17 also mounted in the door, the upper or inlet end of the hopper, when the door is closed, registering with the lower or outlet end of a chute 18 leading from the coal bunker. The belt 9 is driven by the drum 10 the shaft 19 whereof is adapted to be coupled to and uncoupled from a companion shaft 20 by a clutch 21. The shaft 20 is driven from a vertical spindle 22 passing through the upper hinge member 23 of the door so as to be coaxial therewith, the rotation of the said shaft 20 being effected by worm and worm wheel gearing 24, 25. The worm shaft 26 is coupled by a belt drive 27 to the shaft 6. The outlet end of the chute 18 may be closed by a slide 28 when the door is to be opened to allow of inspection of the pulverizer.

Hot air is admitted to the pulverizer at the side opposite to that at which the belt 9 introduces the coal, 29 being the trunk employed for this purpose.

I claim:

A supplying device for coal pulverizers, comp-rising a hinged inspection door, a moving conveyor for introducing the fuel directly into the pulverizer through said hinged inspection door by which said conveyor is carried, and a gear for driving said conveyor, said gear including toothed wheels one whereof is coaxial with the hinge axis of the door.

In testimony whereof he has signed this specification.

WILLIAM ARMSTRONG WOODESON. 

